One nice features of the more expensive balancers (I use a Microvib II) is the ability to do spectrum analysis.
These can help identify vibration problems that may be a result of internal engine issues and give a snapshot of engine vibration "health".
Walt Aronow, Dallas, TX (52F) RV7A, IO360, C/S, 1500+hrs
EXP Aircraft Services LLC
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RV7A built 2004, 1700+ hrs
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